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WFM-SERIES W F M - S E R I E S P u l se M E T E R i n str u c ti o n s Pulse METER instructions GENERAL INFORMATION, INSTALLATION and MAINTENANCE GENERAL INFORMATION SPECIFICATIONS WFM-Series meters use the internationally-accepted multi-jet principle. A gear train drives the register totalizer dials. For pulse output, one of the pointers is replaced by a magnet arm, which is detected by an encapsulated sensor attached to the outside of the lens. Power 6 mA at 12 Vdc (WFMxx2 only) Temperature 105˚ F (40˚ C) max Pressure 150 psi operating MaterialsBody Cast bronze, epoxy powder coated inside and out Internals Engineered thermoplastic Magnet Alnico WFMxx2 meters use a solid-state, long-lasting Hall-effect sensor, which requires power. They are suited for use with Walchem controllers and metering pumps that have sensor power. WFMxx1 meters use a reed switch. They provide a dry contact closure and do not require power. WFMxx0 meters do not have a sensor, and they totalize only. Accuracy +/- 1.5% of reading Pulse Output Sensor Maximum Current Maximum Voltage Cable Length 12’ (4 m) standard (2000’ maximum run) Flow Rates (GPM) 3/4” 1” 1-1/2” 2” 0.22 22 0.44 52 0.88 88 1.98 132 Minimum *Maximum WFMxx2 Hall-effect 20 mA 24 Vdc WFMxx1 WFMxx0 Reed switch Totalizer only 20 mA n/a 24 Vdc or Vac n/a *CAUTION: Excessive flow can cause breakage. Do not exceed recommended maximums. Installation Position. WFM-Series meters should be installed horizontally with the register up. Vertical mounting will result in some degree of under-measurement and shortened life of the bearings. No upstream straight pipe is required. Pulse Output. Both WFMxx2 and WFMxx1 sensors respond to a magnet that rotates on the face of the meter under the lens. The sensor turns on and off once each time the magnet passes under it. Sensors are designed for electronic control loads, and should not be used to switch power loads or line voltages. See maximum current and voltage ratings, under Specifications. Caution: These water meters are not recommended for installation in uninsulated suspended ceilings where freezing is possible, or in any overhead indoor piping configuration where leakage may cause damage. Maintenance Walchem recommends all service to be performed by an authorized distributor or the factory to maintain the integrity of the protective tamper-proof wire-and-seal. Couplings. Male NPT threaded couplings are included with each meter. The threads on the end of the meter are IPS straight threads one size bigger than the meter size. Though it is possible to thread a standard pipe coupling directly onto the meter for close coupling, the included couplings are much preferable because they provide a union connection for meter service. Be sure to use the included gasket between the end of the meter and the coupling. Calibration. Meters used for billing or billing exemption may be regulated by state or local authorities. New meters are factory-tested to meet the AWWA C-708 Multi-Jet Meter accuracy specification. Some states require retesting at various intervals, typically eight years for 3/4" meters, six for 1", and four for 1-1/2" and 2". Meters used for control should be tested every 5-10 years. Testing can be done by the factory or local meter shops authorized for this purpose. Please contact Walchem before sending meter in for calibration or servicing. WARNING DO NOT INSTALL meter in overhead Indoor piping or where leakage may cause damage Connections. WFMxx2 and WFMxx1 sensors are supplied with a color coded output cable (see diagram, page 3). Optional connectors can be ordered to plug directly into a Walchem controller or metering pump. Page 2 Inlet Strainer. Clean the strainer yearly, or as required, depending on water condition. Pull out the strainer or backflush the meter to loosen trapped particulates. Changing Pulse Rates: See Page 3. Internal Parts Replacement: See Page 4. CHANGING PULSE RATES Setting Your Pulse Rate. The pulse rate is determined by which sensor was ordered from the factor y (single reed switch, dual reed switch, or single Hall-effect) and by the dial on which the magnet pointer is located. The pointer is set at the factory, but can be changed in the field as follows. In the table below: 1) Locate your meter size (Column 1); 2) Find your desired pulse rate (Column 2); 3) Note the magnet pointer position (Column 3); 4) Move the magnet pointer to the appropriate dial position (using the detailed instructions below the table); 5) Use the appropriate Connection Diagram (from Column 4) to wire the sensor to your remote device (using diagrams on page 4). Col. 1 Meter Size Col. 2 Pulse Rate *20 P/G 10 P/G 3/4" *2 P/G 1 P/G *5 G/P 10 G/P *50 G/P 100 G/P *2 P/G 1" Meter Pointer Dial Position Connection Diagram # factory pre-set only factory pre-set only 2 1 X1 1 X10 X10 X0.1 2 *2 P/G X0.1 2 10 G/P X1 X1 *50 G/P X10 2 *2 P/G 1 P/G X0.1 X0.1 2 1 X1 X1 2 X10 X10 1 2 1 *50 G/P 100 G/P X10 1 0.0 X X0.1 X1 1 1 2 10 G/P U.S. GALLONS 1 X0.1 *5 G/P [With the magnet pointer on the x1 dial, the pulse rate would be 10x1=10 Gal/Pulse. With the magnet pointer on the x0.1 dial, the pulse rate would be 10x.1=1 Gal/Pulse.] X100 20mm 40˚C 1 2 1 P/G *5 G/P X10 X1 Special Configurations. 2 2 X10 X10 2 X10 X1 U.S. GALLONS X0.1 1 *50 G/P 10 G/P Magnet Pointer x10 Dial (10 x 10=100 G/P) X100 25mm 40˚C 1 X0.1 X0.1 X1 1” Meter 100 Gal/Pulse 2 X0.1 X1 100 G/P 2" Col. 4 1 P/G *5 G/P 100 G/P 1-1/2" Col. 3 Sample Set-Up. A 1” meter is shown with the magnet pointer set at the x10 dial, with a pulse rate of 100 Gallons per Pulse (that is, 10 increments on the x10 dial, or 10x10=100 Gal/Pulse). The 3/4” meter has a fourth dial, as shown above. The x0.01 dial is used for 20 P/G and 10 P/G rates. Note: The 3/4” meter has a 5 digit totalizer. 1 1 *These pulse rates available in WFMxx1 dual reed switch meters only. Moving the Magnetic Pointer. Remove meter top and lens, taking care not to lose the sealing ring. With fingers, lift the magnet pointer off its shaft and remove the plain pointer from the target dial. Reverse their positions and press them firmly into place. Securely seat the sealing ring and replace the lens, matching the tab on the lens to the notch on the meter to align the sensor with the magnetic pointer dial. Thread the meter top on and tighten. †NOTE: A special magnet (available from the factory) is required to achieve a rate of 4 pulses per gallon. It should be placed on the x0.1 dial, with non-magnetic pointers on the remaining dials. Otherwise, the procedure is the same. Reading Your Meter. The Total Flow that has passed through your meter is read by starting at the top of the register with the Six-Digit Totalizer, and then reading clockwise around the small dials. In the example below, the Six-Digit Totalizer reads 13,800 (138 x 100), and the dials read 60 (6 x 10), 2 (2 x 1), and .4 (4 x .1) respectively. The Total Flow is 13,862.4 gallons. 1” Meter 100 Gal/Pulse 1 3 8 25mm 40˚C U.S. GALLONS X0.1 X1 X100 X10 Five Digit Totalizer (reads 138x100) x10 Gal Dial (reads 6x10) x1 Gal Dial (reads 2x1) x0.1 Gal Dial (reads 4x0.1) (NOTE: Disregard the color of the numbers on the totalizer when reading your total.) The “ones” digit is significant but the fact that it is red is not significant. Page 3 CONNECTION, MAINTENANCE and REPAIR CONNECTION DIAGRAMS Diagram 1: Single Sensor Diagram 2: Dual Sensor Blue - (No Connection) Black - Common WFMxx1: Red - N O Reed Switch Black ( - ) White (signal) Red (+) NOTE: The Dual Sensor is distinguished by a red stripe on the cable at the base of the sensor. Black - Common Red - N O Blue - N O WFMxx2: Hall-Effect WFMxx1: Reed Switch NOTE: MJ(H)E not available with dual sensor To Distinguish Single Sensor From Dual: Single: (if new from factory) blue wire is cut back on cable end. Dual: A red stripe will be on cable near sensor. Note: Dual sensor can be used as a single sensor also - use either the red OR the blue wire w/black. If using it as a dual sensor then connecting red and blue together will produce two pulses with every revolution of magnet. Internal Parts Replacement. All of the internal parts of an WFM-Series meter lift out as a unit, after the top has been unscrewed. The lens can then be removed and the internal assembly lifted out. If necessary, turn the meter upside down and tap one end lightly on a countertop to loosen the internals. The assembly can be separated by hand. WFM-Series Parts WFM-SERIES 3/4” 1” 1 2 3 4 5 6 7 8 9 10 11 51662 51665 51668 51676 51680 51684 51685 51650 51651 51652 51654 51686 51689 51663 51666 51669 51677 51681 51684 51685 51650 51651 51652 51655 51687 51690 WFM-SERIES 1 1/2” 2” 1 2 3 4 5 6 7 8 9 10 11 51664 51667 51670 51678 51682 51684 51685 51650 51651 51652 51656 51688 51691 51664 51667 51671 51679 51683 51684 51685 51650 51651 51652 51657 51688 51692 a b c a b c Lid and Hinge Pin Assembly Lens Gasket Assembly Internal Assembly (gallons) Coupling Assembly (incl 2 sets) Coupling Gasket Assembly (incl 2) Lens Sensor Screw Single Reed Switch Sensor (WFMxx1) Double Reed Switch Sensor (WFMxx1) Single Hall-Effect Sensor (WFMxx2) Register (gallons) Internal Strainer Tubular Strainer Lid and Hinge Pin Assembly Lens Gasket Assembly Internal Assembly (gallons) Coupling Assembly (incl 2 sets) Coupling Gasket Assembly (incl 2) Lens Sensor Screw Single Reed Switch Sensor (WFMxx1) Double Reed Switch Sensor (WFMxx1) Single Hall-Effect Sensor (WFMxx2) Register (gallons) Internal Strainer Tubular Strainer Except as noted, individual parts are not available. 1 6 7 8 a-c 2 9 3 10 11 5 (includes 2) 4 (includes 2 sets) 5 Boynton Road Hopping Brook Park Holliston, MA 01746 • Tel: 508-429-1110 Fax: 508-429-7433 www.walchem.com Page 4 PL-WA-13326-C 3/09